Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) holds an A-grade boiler manufacturing license, A2-grade pressure vessel manufacturing license, A2-grade pressure vessel design license, B-grade boiler installation, and GB2/Class, GC2/Class pressure pipeline installation licenses, as well as a mechanical and electrical equipment installation contracting qualification. It is a member of the China Boiler and Water Treatment Association, the China Chemical Equipment Association, and the Council Member of the Shandong Equipment Manufacturing Association. The company has also passed certifications for the ISO9001 Quality Management System, ISO14001 Environmental Management System, OHSAS18001 Occupational Health and Safety Management System, and the American ASME/U2 certification.
When initially using a liquid nitrogen tank, there are several precautions to consider for safe and effective operation. Here are some suggested points to keep in mind:
Safe Operation: Liquid nitrogen is a low-temperature liquid with strong refrigerating and asphyxiating effects. When handling liquid nitrogen tanks, it is mandatory to wear appropriate personal protective equipment, such as insulated gloves and protective suits. Avoid direct contact with liquid nitrogen to prevent injury or other harm.
Ventilation Environment: Liquid nitrogen evaporation produces a large amount of gas, which may displace other gases, leading to a decrease in oxygen content in the air. Therefore, when using liquid nitrogen tanks, it is essential to ensure proper ventilation in the operating area to prevent oxygen deficiency.
Tank Inspection: Prior to the first use of a liquid nitrogen tank, a thorough visual and sealing inspection should be conducted. Ensure the tank has no evident damage, leaks, or other safety hazards. If any issues are found, they should be promptly repaired or the tank replaced.
Tank Filling: Prior to the first use of the liquid nitrogen tank, it is necessary to fill it with liquid nitrogen. During the filling process, follow the correct operational steps and safety protocols to ensure the process is safe and reliable. Additionally, pay attention to controlling the filling speed and pressure to avoid excessive tank pressure and temperature rise.
Labeling and Record Keeping: Prior to the initial use of the liquid nitrogen tank, relevant information such as the storage medium, capacity, and manufacturing date should be labeled on the tank. It is also recommended to establish a usage record for the tank, including filling dates, filling quantities, and usage details, for future tracking and management.
Note that the use of liquid nitrogen tanks involves safety risks such as low temperatures and high pressures. Operators should receive training and strictly adhere to the relevant operational procedures and safety measures. If you are unfamiliar with the operation or have doubts, it is recommended to consult experts or relevant organizations for guidance.

Routine inspections and maintenance of liquid oxygen storage tanks are crucial for ensuring safe operation. The following are general steps for the daily checks and maintenance of liquid oxygen storage tanks:
Visual Inspection: Regularly inspect the exterior of the tank, including the shell, welds, valves, and fittings. Pay attention to any abnormal conditions such as cracks, corrosion, or deformation.
Leak Detection: Utilize appropriate leak detection equipment to inspect for leaks in storage tanks and connecting areas. Leak detection can be conducted using methods such as gas detectors or liquid oxygen detection agents.
Pressure Testing: Conduct regular pressure tests to check the tank's sealing and pressure resistance. Perform pressure tests in accordance with relevant standards and regulations, and record the test results.
Valve and Fitting Inspection: Verify that the valves and fittings on the tank are operating correctly and for any signs of loosening or damage. Ensure that the valves open and close smoothly and reliably.
Insulation Layer Inspection: Check for any damage or detachment in the tank's insulation layer. Repair or replace any damaged insulation materials to ensure effective insulation.
Cleaning and Drainage: Regularly clean the interior of the tank to remove accumulated impurities and dirt. Regularly drain to prevent contaminants and sediments in liquid oxygen from damaging the tank.
Safety Equipment Inspection: Inspect the safety equipment around the storage tanks, such as fire separation areas and alarm systems, to ensure they are functioning properly.
Record and Document Management: Document the results of each inspection and maintenance, including the inspection date, content, issues found, and corrective measures. Establish comprehensive management records and documentation to track and manage the storage tank's operational status.
Note that inspections and maintenance of liquid oxygen tanks should be conducted by trained personnel, following relevant regulations and standards. Ensure safety during maintenance and operation, and consult experts for accurate guidance.

The leak treatment methods for liquid argon storage tanks mainly include the following steps:
Identifying Air Leaks: Air leaks in liquid argon storage tanks are discovered through methods such as odor detection, gas detection instruments, or abnormal pressure in liquid argon storage tanks.
Confirm air leakage location: Use gas detection instruments or foam leak detection agents, etc., to pinpoint the exact location of air leakage. Check tank interfaces, valves, pipeline connections, and other areas to locate the air leakage points.
Seal Air Leaks: Take appropriate measures to stop air leaks based on their location. For instance, for leaks at joints, inspect and adjust sealing washers or tighten bolts; for valve leaks, check and replace seals.
Isolate Air Leaks: During the process of dealing with air leaks, it is necessary to isolate the leaky areas to ensure personnel safety. Set up warning signs, restrict access to the area, and take necessary protective measures, such as wearing protective masks and gloves.
Evacuate liquid argon: If air leakage cannot be repaired immediately or the leakage is significant, consider evacuating the liquid argon. By gradually reducing the pressure of liquid argon in the storage tank, convert it into gas to minimize the risk of air leakage.
Ventilation Treatment: During the leak treatment process, ensure adequate ventilation and promptly exhaust the gases produced by the evaporation of liquid argon. This can be achieved through natural ventilation or by using ventilation equipment to expel the evaporated gas outside.
Safety Assessment and Repairs: After the air leakage treatment is completed, conduct a safety assessment to ensure the tank's safety. Based on the assessment results, carry out any necessary repairs and maintenance to prevent future air leakage.
Note: Liquid argon is a low-temperature liquid with a low boiling and freezing point. Caution is required when dealing with air leaks to avoid contact with liquid argon and subsequent coldness. When handling air leaks in liquid argon storage tanks, the operation should be performed by personnel, adhering to the relevant safety operating procedures and standards.

The operation and protection procedures for the application of low-temperature liquid nitrogen storage tanks should include the following:
Staff Training: All operators are required to undergo safety training for liquid nitrogen storage tanks, familiarizing themselves with the properties, hazards, and proper operation procedures as well as emergency response measures.
Protective Gear: Operators must wear appropriate protective gear, including gloves, protective clothing, and non-slip shoes, to safeguard themselves against the low temperatures of liquid nitrogen and other hazards.
Ventilation Requirements: Ensure adequate ventilation in the operational area of the liquid nitrogen storage tank to expel gases produced by the evaporation of liquid nitrogen. Avoid excessive oxygen concentration to minimize the risk of fire and explosion.
Leak Control: Tanks must be equipped with leak detection and alarm systems to promptly identify and control the leakage of liquid nitrogen. Upon detection of a leak, immediate action should be taken to control the source of the leak and proceed with repairs.
Fire Prevention Measures: Nitrogen liquid has a low boiling and freezing point, which is prone to fire. Measures such as setting up firewalls around liquid nitrogen storage tanks and using fire-resistant coatings are taken to prevent fires from occurring and spreading.
Static Protection: The accumulation of static electricity in liquid nitrogen tanks may cause sparks, increasing the risk of fire. Measures such as using static-conductive materials and anti-static equipment should be taken to reduce the accumulation and release of static electricity.
Regular inspections and maintenance: Conduct regular checks on the condition of liquid nitrogen tanks and related equipment, including valves, pipelines, pressure gauges, etc. Ensure that the equipment is intact and promptly repair or replace any damaged parts.
Waste Gas Treatment: Nitrogen liquid storage tanks produce waste gas during operation, which necessitates appropriate waste gas treatment measures to prevent potential harm to the environment and human health.
Emergency Response Plan: Develop an emergency response plan for liquid nitrogen storage tanks, including procedures for handling leaks, emergency rescue measures, and the process for notifying relevant departments. Operators
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